Wal-Mart trains its managers to tell employees that unions are "a waste of money" and "want to hurt Walmart," according to documents leaked by the online hacker group Anonymous and obtained by Occupy Wall Street.

The documents are part of a PowerPoint slideshow used to train store managers. Wal-Mart spokesman Kory Lundberg confirmed to Business Insider that the company uses the slideshow.

The slides discourage employees from joining union-backed groups like OUR Walmart, which fights for higher wages and more opportunities for advancement for Wal-Mart's employees.

As we've reported in the past, OUR Walmart is partly funded by — and shares a mailing address with — the United Food and Commercial Workers International Union. It was launched more than two years ago following a series of unsuccessful attempts to unionize Wal-Mart’s employees.

The slideshow also contains a "Duty of Loyalty" slide mandating that managers report union activity to a labor relations hotline "immediately."